Olsson, Per
(2006).
Effects of fertilisation on rhizospheric and heterotrophic soil CO2 efflux in boreal Norway spruce stands.
Umeå :
Sveriges lantbruksuniv.
, Stencilserie / Sveriges lantbruksuniversitet, Skogsvetenskapliga fakulteten, Institutionen för skogsekologi, 1104-1870
; 113
ISBN SLU-SEKOL-STL-113-SE
[Licentiate thesis]
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Abstract
There are strong indications that the global mean temperature is rising. The increase in temperature is mainly attributed to the increase in the atmospheric CO2 concentration, [CO2], the result of anthropogenic emissions from burning fossil fuels and changes in land-use, mainly deforestation. The total emissions of CO2 cannot be accounted for by the measured increase in [CO2], nor by the amounts estimated to be taken up by oceans and terrestrial ecosystems, hence there is a missing sink for CO2, where the boreal forest may play an important role. The tree growth in boreal forests is limited by climate and nutrients, hence could a warmer climate, and more available nutrients, increase production. Increased temperature may, however, also accelerate decomposition of soil organic matter. Since production and decomposition is affected by the availability of nutrients, increased N-deposition or forest fertilisation may mitigate the effects of global warming. The main objective of the present study was to determine the effects of nutrient supply on soil respiratory components in a boreal Norway spruce forest, especially the effects on heterotrophic and rhizospheric activity. To partition soil respiration into these components, tree-girdling, which terminates the carbohydrate supply from photosynthesis to the rhizospheric component, was used. The study was conducted in 40-year-old Norway spruce stands in Northern Sweden, which were growing at growth-limiting and optimised availability of soil nutrients, respectively. During the period of annual maxima of soil respiration, fertilisation decreased rhizospheric soil CO2 efflux by approximately 50%. Also heterotrophic soilCO2 efflux was approximately 40% lower in fertilised plots, than in non-fertilised plots, despite a three-fold higher above-groundproduction in thefertilised plots. In conclusion forest fertilisation contributes to C sequestration by increasing biomass production as well as retarding decomposition of soil organic matter.
Authors/Creators: | Olsson, Per | ||||
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Title: | Effects of fertilisation on rhizospheric and heterotrophic soil CO2 efflux in boreal Norway spruce stands | ||||
Series Name/Journal: | Stencilserie / Sveriges lantbruksuniversitet, Skogsvetenskapliga fakulteten, Institutionen för skogsekologi | ||||
Year of publishing : | January 2006 | ||||
Number: | 113 | ||||
Number of Pages: | 29 | ||||
Papers/manuscripts: |
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Place of Publication: | Umeå | ||||
ISBN for printed version: | SLU-SEKOL-STL-113-SE | ||||
ISSN: | 1104-1870 | ||||
Language: | English | ||||
Publication Type: | Licentiate thesis | ||||
Full Text Status: | Public | ||||
Agris subject categories.: | F Plant production > F04 Fertilizing P Natural resources > P34 Soil biology | ||||
Subjects: | Not in use, please see Agris categories | ||||
Agrovoc terms: | picea abies, forest soils, carbon dioxide enrichment, storage, soil respiration, carbon cycle, nutrients, fertilizer application, girdling, boreal forests, sweden | ||||
Keywords: | autotrophic respiration, girdling, Picea abies, soil respiration, soil organic matter, starch | ||||
URN:NBN: | urn:nbn:se:slu:epsilon-865 | ||||
Permanent URL: | http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-865 | ||||
ID Code: | 1020 | ||||
Department: | (S) > Institutionen för skogsekologi (930701-061231) | ||||
Deposited By: | Per Olsson | ||||
Deposited On: | 11 Jan 2006 00:00 | ||||
Metadata Last Modified: | 02 Dec 2014 10:09 |
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